PROCESS FOR PREPARING SODIUM SALTS OR POTASSIUM SALTS OF 4-HYDROXY-2-OXO-2,5-DIHYDROFURAN-3-CARBOXYLATE
申请人:Funke Christian
公开号:US20140148604A1
公开(公告)日:2014-05-29
Process for preparing sodium or potassium salts of 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylic esters, comprising the reaction of a malonic ester with potassium hydroxide to give the corresponding malonic ester potassium salt of the formula (III)
which is then reacted further with a chloroacetic ester to give a compound of the formula (V)
followed by a ring closure reaction in which the compound of the formula (V) is reacted with a sodium or potassium alkoxide of the formula ZOR
1
where R
1
, R
2
, R
3
and K are each as defined in the description.
Process for preparing 2,2-difluoroethylamine derivatives, wherein compounds of the general formula (IV) are reduced to the corresponding 2,2-difluoroethylamine derivatives of the general formula (III), where the A radical is as defined in the description:
MULTISTAGE PROCESS FOR PREPARING ALKALI METAL SALTS OF SPECIFIC 4-HYDROXY-2-OXO-2,5-DIHYDROFURAN-3-CARBOXYLIC ESTERS
申请人:BAYER CROPSCIENCE AG
公开号:US20150210662A1
公开(公告)日:2015-07-30
The present invention relates to a multi-stage method for preparing alkali metal salts of specific 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylic esters of the formula (I),
in which M and R
1
are as defined in the description,
which proceeds from malonic ester and does not require isolation of intermediates.
Reaction of Nitromethane with Cinnamoyl Derivatives of Cyclic β-dicarbonyl Compounds. Application to the Synthesis of 2(3)-(4-aryl-pyrrolidin-2-ylidene)-1,3(2,4)-diones*
作者:F. S. Pashkovsky、J. S. Dontsu、D. B. Rubinov、F. A. Lakhvich
DOI:10.1007/s10593-014-1606-0
日期:2015.1
that reaction of nitromethane with cinnamoyl derivatives of five- and six-membered carbo- and heterocylic β-dicarbonyl compounds in the presence of 1,1,3,3-tetramethylguanidine proceeds according to the mechanism of 1,4-conjugate addition to the enone fragment of cinnamoyl moiety to give 2(3)-( 3-aryl-4-nitrobutanoyl)-substituted cyclic 1,3- or 2,4-diones in good to excellent yields. Chemoselective reduction
Method for reducing a susceptibility to tumor formation induced by 3-deoxyglucosone and precursors thereof
申请人:Brown R. Truman
公开号:US20060089316A1
公开(公告)日:2006-04-27
Disclosed are methods of using various compounds, which are known to bind to 3-deoxyglucosone (3DG) or precursors thereof, in order to reduce a susceptibility to tumor formation and/or to prevent or delay onset of tumor formation induced by 3DG and its precursors. Also disclosed is the reduction of 3DG levels in high fructose corn syrop so that the high fructose corn syrup is less likely to induce tumor formation.